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Shares were up 5.2% to $41 after hours Wednesday as results were better than expected. Through Wednesday's close, the stock has climbed 60% over the past three months.

"The fourth quarter was another terrific one as incredible execution by the Zillow team re-accelerated year-over-year growth, and delivered revenue and profit that exceeded our expectations," said Chief Executive Spencer Rascoff.

Mr. Rascoff said the company in 2013 will focus on attracting more users, boosting its premier agent business and accelerating its emerging mortgage, rental and home-improvement marketplaces.

Seattle-based Zillow, which went public in July 2011, became popular by estimating home values on its website. The company said quarterly traffic rose 47% from a year earlier to 34.5 million average monthly unique users. More than 50% of visits came from mobile devices in December, Zillow noted.

Overall, Zillow posted a profit of $549 million, or two cents a share, down from $922 million, or three cents a share, a year earlier. Analysts polled by Thomson Reuters had projected the company to post a per-share loss of seven cents, on a fully-reported basis.

Revenue jumped 73% to $34.3 million. Zillow's November forecast called for revenue between $30 million and $31 million, below analyst expectations at the time.

Total costs and expenses were up 78% at $33.8 million as the latest period included an increase in depreciation and amortization expense and share-based compensation expense, primarily related to acquisitions. Sales and marketing costs climbed 92% while technology and development costs more than doubled.

Zillow's marketplace unit, which provides advertising services and sales leads to lenders and agents, saw revenue climb 95% to $26.8 million. The company said it achieved record marketplace revenue in the latest period while executing a pricing-model transition in its premier agent business. Display revenue improved 22% to $7.5 million.

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